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← ScienceWhich outcome occurs when a scanning tunneling microscope encounters surface contamination?
A)Increased tunneling current oscillation
B)Tip-sample direct physical contact
C)Decreased resolution of atomic features✓
D)Stable atomic orbital mapping
💡 Explanation
When a scanning tunneling microscope encounters surface contamination, quantum tunneling probability is significantly reduced because the contamination layer acts as a barrier, hindering electron transmission leading to decreased resolution. Therefore resolution decreases, rather than oscillation, tip contact, or stable mapping, which require optimal tunneling conditions.
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